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Old 06-27-2019, 07:04 PM   #1
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Default PEX and Water Hammer

Hello all:

2 years ago I replaced piece of pex-a pipe connected to 20 feet strait copper pipe going to outside hose bib (see the picture): I took out bursted piece and replaced with new pex-a piece.

This is inside the house basement in a furnace room.

Yesterday I got the call from the same client – pex bursted again in a same place. I come and see the same picture I took 2 years ago. This time I replaced all the pex with copper.

I figured it happened because of the water hammer from using fast closing pistol grip garden hose nozzle.

Well... So much for pex hype... Watch out for pex...

What do you think about it ?

Would appreciate your thoughts.
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PEX and Water Hammer-pex-water-hammer-2.jpg  

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PEX and Water Hammer-pex-water-hammer-4.jpg  

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Old 06-27-2019, 08:36 PM   #2
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you may have some bad pex, never had a problem like that, how old is the pex you used? did it sit outside for long in the sun?
I doubt water hammer would split pex...you should do a little more investigating to the cause..
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Old 06-27-2019, 09:07 PM   #3
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Thanks for your reply.

1) It happened to pex-a.

2) Two times In a same spot: June 2017 and June 2019.

3) 2 years apart - so pexes from different batches.

4) I never keep my pex in a sun – always in a cotton bag inside the van.

5) It wasn't an old pex - I buy a roll at my plumbing supplier and it is gone in a few month -> buy a new one -> and so on. Don't have old one seating around.

Thanks.
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Old 06-27-2019, 09:15 PM   #4
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Your crimps look way too tight. I doubt the pex is at fault, I bet something else is causing the split.
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Old 06-27-2019, 09:30 PM   #5
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Quote:
Originally Posted by VictorPlumber View Post
Thanks for your reply.

1) It happened to pex-a.

2) Two times In a same spot: June 2017 and June 2019.

3) 2 years apart - so pexes from different batches.

4) I never keep my pex in a sun – always in a cotton bag inside the van.

5) It wasn't an old pex - I buy a roll at my plumbing supplier and it is gone in a few month -> buy a new one -> and so on. Don't have old one seating around.

Thanks.

pex a has a lower bursting point than pex b..what is the water pressure in the house? but even with that it shouldnt burst from water hammer..
does this client hook any pressure washer or any pumps to this hose bib? looks like someone back fed high pressure into the hose bib to burst pipe..
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Old 06-27-2019, 09:40 PM   #6
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Why are you crimping pex A? That’s expansion pex. They say you can crimp it but it voids warranty.
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Old 06-27-2019, 09:40 PM   #7
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Quote:
Originally Posted by Tango View Post
Your crimps look way too tight. I doubt the pex is at fault, I bet something else is causing the split.
I always check my crimps. Go - goes, NoGo - doesn't go.

It happened right in a middle of the pex pipe away from crimp rings.

I use same crimper for about 10 years to all my pex connections - all good, never a problem.

I think pex can't take the water hammer pressure spike in this case.

I changed it to all copper - we shall see what would happen.

Thanks
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Old 06-27-2019, 09:53 PM   #8
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Quote:
Originally Posted by ShtRnsdownhill View Post
pex a has a lower bursting point than pex b..what is the water pressure in the house? but even with that it shouldnt burst from water hammer..
does this client hook any pressure washer or any pumps to this hose bib? looks like someone back fed high pressure into the hose bib to burst pipe..
Normal water pressure - 60 psi. No pressure washers, no pumps. 70 years old lady is living by herself.
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Old 06-27-2019, 10:01 PM   #9
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Quote:
Originally Posted by Debo22 View Post
Why are you crimping pex A? That’s expansion pex. They say you can crimp it but it voids warranty.
I always crimp pex-a - that's what my supplier sells - pex-a.

Never heard crimping pex-a voids warranty on pex-a ???

Thanks
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Old 06-27-2019, 10:03 PM   #10
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Another thing I'm used to buying pex that has the black interior that looks like polyethylene. Your on the other hand looks see through and I wonder if it's less stress resistant.
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